1st 340 build

Greeting everyone. I have acquired a bare 340 block pretty recently. I have never assembled a short block before so I need some help. I have been doing some research on cranks and I noticed that there seems to be a difference in early year and later 340 cranks. Is it just the material? Or are they balanced different? From what I have seen the early units were forged. I am on a very limited budget and am really trying to avoid machine costs. So can I just get a remaned crank from autozone or somewhere. I looked and they are only 200 bucks. Any rotating assembly thoughts would be helpful.